Microstructure control and change in thermal conductivity of 8YSZ/SiO2 multi-compositional coating by suspension plasma spraying
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In recent years, thermal insulation coating technology for automotive engine parts has received significant attention as a meansof improving the thermal efficiency of automotive engines. One of the characteristics of thermal insulation coatings is their lowthermal conductivity, and, materials such as YSZ (Yttria-stabilized zirconia), which have low thermal conductivity, are usedfor this purpose. This research presents a study of the changes in the microstructure and thermal conductivity of 8YSZ/SiO2multi compositional thermal insulation coating for different compositions, and particle size distributions of suspension, whenit is subjected to suspension plasma spraying. To obtain a porous coating structure, the mixing ratio of 8YSZ and SiO2 particlesand the particle sizes of the SiO2 were changed. The microstructure, phase formation behavior, porosity and thermalconductivity of the coatings were analyzed. The porosities were found to be 1.2-32.1%, and the thermal conductivities of thecoatings were 0.797-0.369 W/mK. The results of the study showed that the microstructures of the coatings were stronglyinfluenced by the particle size distributions, and that the thermal conductivities of the coatings were greatly impacted by themicrostructures of the coatings.
Abstract
In recent years, thermal insulation coating technology for automotive engine parts has received significant attention as a meansof improving the thermal efficiency of automotive engines. One of the characteristics of thermal insulation coatings is their lowthermal conductivity, and, materials such as YSZ (Yttria-stabilized zirconia), which have low thermal conductivity, are usedfor this purpose. This research presents a study of the changes in the microstructure and thermal conductivity of 8YSZ/SiO2multi compositional thermal insulation coating for different compositions, and particle size distributions of suspension, whenit is subjected to suspension plasma spraying. To obtain a porous coating structure, the mixing ratio of 8YSZ and SiO2 particlesand the particle sizes of the SiO2 were changed. The microstructure, phase formation behavior, porosity and thermalconductivity of the coatings were analyzed. The porosities were found to be 1.2-32.1%, and the thermal conductivities of thecoatings were 0.797-0.369 W/mK. The results of the study showed that the microstructures of the coatings were stronglyinfluenced by the particle size distributions, and that the thermal conductivities of the coatings were greatly impacted by themicrostructures of the coatings.
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